// Muduo - A reactor-based C++ network library for Linux
// Copyright (c) 2010, Shuo Chen.  All rights reserved.
// http://code.google.com/p/muduo/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//   * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//   * Neither the name of Shuo Chen nor the names of other contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


#ifndef CLUSNET_BASE_PROCESSINFO_H
#define CLUSNET_BASE_PROCESSINFO_H

#include <clusnet/base/Timestamp.h>

#include <vector>
#include <string>
#include <sys/types.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/resource.h>

namespace clusnet
{
namespace base
{

namespace ProcessInfo
{
    inline pid_t pid()
    {
        return ::getpid();
    }
    inline std::string pidString()
    {
        char buf[32];
        snprintf(buf, sizeof buf, "%d", pid());
        return buf;
    }
    inline uid_t   uid()
    {
        return ::getuid();
    }
    inline std::string username()
    {
        struct passwd pwd;
        struct passwd* result = nullptr;
        char buf[8192];
        const char* name = "unknownuser";

        ::getpwuid_r(uid(), &pwd, buf, sizeof buf, &result);
        if (result)
        {
            name = pwd.pw_name;
        }
        return name;
    }
    inline uid_t   euid()
    {
        return ::geteuid();
    }

    inline std::string hostname()
    {
        char buf[256];
        if (::gethostname(buf, sizeof buf) == 0)
        {
            buf[sizeof(buf) - 1] = '\0';
            return buf;
        }
        else
        {
            return "unknownhost";
        }
    }

    inline std::string exePath()
    {
        std::string result;
        char buf[1024];
        ssize_t n = ::readlink("/proc/self/exe", buf, sizeof buf);
        if (n > 0)
        {
            result.assign(buf, n);
        }
        return result;
    }
}
}
}

#endif 
